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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrXferProcessor.h"
#include "GrPipeline.h"
#include "GrPipelineBuilder.h"
#include "GrProcOptInfo.h"
#include "gl/GrGLCaps.h"
GrXferProcessor::GrXferProcessor()
: fWillReadDstColor(false)
, fDstReadUsesMixedSamples(false)
, fDstTextureOffset() {
}
GrXferProcessor::GrXferProcessor(const DstTexture* dstTexture,
bool willReadDstColor,
bool hasMixedSamples)
: fWillReadDstColor(willReadDstColor)
, fDstReadUsesMixedSamples(willReadDstColor && hasMixedSamples)
, fDstTextureOffset() {
if (dstTexture && dstTexture->texture()) {
SkASSERT(willReadDstColor);
fDstTexture.reset(dstTexture->texture());
fDstTextureOffset = dstTexture->offset();
this->addTextureAccess(&fDstTexture);
this->setWillReadFragmentPosition();
}
}
GrXferProcessor::OptFlags GrXferProcessor::getOptimizations(
const GrPipelineOptimizations& optimizations,
bool doesStencilWrite,
GrColor* overrideColor,
const GrCaps& caps) const {
GrXferProcessor::OptFlags flags = this->onGetOptimizations(optimizations,
doesStencilWrite,
overrideColor,
caps);
if (this->willReadDstColor()) {
// When performing a dst read we handle coverage in the base class.
SkASSERT(!(flags & GrXferProcessor::kIgnoreCoverage_OptFlag));
if (optimizations.fCoveragePOI.isSolidWhite()) {
flags |= GrXferProcessor::kIgnoreCoverage_OptFlag;
}
}
return flags;
}
bool GrXferProcessor::hasSecondaryOutput() const {
if (!this->willReadDstColor()) {
return this->onHasSecondaryOutput();
}
return this->dstReadUsesMixedSamples();
}
void GrXferProcessor::getBlendInfo(BlendInfo* blendInfo) const {
blendInfo->reset();
if (!this->willReadDstColor()) {
this->onGetBlendInfo(blendInfo);
} else if (this->dstReadUsesMixedSamples()) {
blendInfo->fDstBlend = kIS2A_GrBlendCoeff;
}
}
void GrXferProcessor::getGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const {
uint32_t key = this->willReadDstColor() ? 0x1 : 0x0;
if (key) {
if (const GrTexture* dstTexture = this->getDstTexture()) {
key |= 0x2;
if (kTopLeft_GrSurfaceOrigin == dstTexture->origin()) {
key |= 0x4;
}
}
if (this->dstReadUsesMixedSamples()) {
key |= 0x8;
}
}
b->add32(key);
this->onGetGLSLProcessorKey(caps, b);
}
GrXferBarrierType GrXferProcessor::xferBarrierType(const GrRenderTarget* rt,
const GrCaps& caps) const {
SkASSERT(rt);
if (static_cast<const GrSurface*>(rt) == this->getDstTexture()) {
// Texture barriers are required when a shader reads and renders to the same texture.
SkASSERT(caps.textureBarrierSupport());
return kTexture_GrXferBarrierType;
}
return this->onXferBarrier(rt, caps);
}
#ifdef SK_DEBUG
static const char* equation_string(GrBlendEquation eq) {
switch (eq) {
case kAdd_GrBlendEquation:
return "add";
case kSubtract_GrBlendEquation:
return "subtract";
case kReverseSubtract_GrBlendEquation:
return "reverse_subtract";
case kScreen_GrBlendEquation:
return "screen";
case kOverlay_GrBlendEquation:
return "overlay";
case kDarken_GrBlendEquation:
return "darken";
case kLighten_GrBlendEquation:
return "lighten";
case kColorDodge_GrBlendEquation:
return "color_dodge";
case kColorBurn_GrBlendEquation:
return "color_burn";
case kHardLight_GrBlendEquation:
return "hard_light";
case kSoftLight_GrBlendEquation:
return "soft_light";
case kDifference_GrBlendEquation:
return "difference";
case kExclusion_GrBlendEquation:
return "exclusion";
case kMultiply_GrBlendEquation:
return "multiply";
case kHSLHue_GrBlendEquation:
return "hsl_hue";
case kHSLSaturation_GrBlendEquation:
return "hsl_saturation";
case kHSLColor_GrBlendEquation:
return "hsl_color";
case kHSLLuminosity_GrBlendEquation:
return "hsl_luminosity";
};
return "";
}
static const char* coeff_string(GrBlendCoeff coeff) {
switch (coeff) {
case kZero_GrBlendCoeff:
return "zero";
case kOne_GrBlendCoeff:
return "one";
case kSC_GrBlendCoeff:
return "src_color";
case kISC_GrBlendCoeff:
return "inv_src_color";
case kDC_GrBlendCoeff:
return "dst_color";
case kIDC_GrBlendCoeff:
return "inv_dst_color";
case kSA_GrBlendCoeff:
return "src_alpha";
case kISA_GrBlendCoeff:
return "inv_src_alpha";
case kDA_GrBlendCoeff:
return "dst_alpha";
case kIDA_GrBlendCoeff:
return "inv_dst_alpha";
case kConstC_GrBlendCoeff:
return "const_color";
case kIConstC_GrBlendCoeff:
return "inv_const_color";
case kConstA_GrBlendCoeff:
return "const_alpha";
case kIConstA_GrBlendCoeff:
return "inv_const_alpha";
case kS2C_GrBlendCoeff:
return "src2_color";
case kIS2C_GrBlendCoeff:
return "inv_src2_color";
case kS2A_GrBlendCoeff:
return "src2_alpha";
case kIS2A_GrBlendCoeff:
return "inv_src2_alpha";
}
return "";
}
SkString GrXferProcessor::BlendInfo::dump() const {
SkString out;
out.printf("write_color(%d) equation(%s) src_coeff(%s) dst_coeff:(%s) const(0x%08x)",
fWriteColor, equation_string(fEquation), coeff_string(fSrcBlend),
coeff_string(fDstBlend), fBlendConstant);
return out;
}
#endif
///////////////////////////////////////////////////////////////////////////////
GrXferProcessor* GrXPFactory::createXferProcessor(const GrPipelineOptimizations& optimizations,
bool hasMixedSamples,
const DstTexture* dstTexture,
const GrCaps& caps) const {
#ifdef SK_DEBUG
if (this->willReadDstColor(caps, optimizations, hasMixedSamples)) {
if (!caps.shaderCaps()->dstReadInShaderSupport()) {
SkASSERT(dstTexture && dstTexture->texture());
} else {
SkASSERT(!dstTexture || !dstTexture->texture());
}
} else {
SkASSERT(!dstTexture || !dstTexture->texture());
}
SkASSERT(!hasMixedSamples || caps.shaderCaps()->dualSourceBlendingSupport());
#endif
return this->onCreateXferProcessor(caps, optimizations, hasMixedSamples, dstTexture);
}
bool GrXPFactory::willNeedDstTexture(const GrCaps& caps,
const GrPipelineOptimizations& optimizations,
bool hasMixedSamples) const {
return (this->willReadDstColor(caps, optimizations, hasMixedSamples) &&
!caps.shaderCaps()->dstReadInShaderSupport());
}
bool GrXPFactory::willReadDstColor(const GrCaps& caps,
const GrPipelineOptimizations& optimizations,
bool hasMixedSamples) const {
return optimizations.fOverrides.fUsePLSDstRead || this->onWillReadDstColor(caps, optimizations,
hasMixedSamples);
}
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